213312311121 has 16 divisors (see below), whose sum is σ = 350050972544. Its totient is φ = 112516383744.

The previous prime is 213312311099. The next prime is 213312311167. The reversal of 213312311121 is 121113213312.

It is not a de Polignac number, because 213312311121 - 2¹⁸ = 213312048977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213312311621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390681616 + ... + 390682161.

It is an arithmetic number, because the mean of its divisors is an integer number (21878185784).

Almost surely, 2^213312311121 is an apocalyptic number.

213312311121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213312311121 is a deficient number, since it is larger than the sum of its proper divisors (136738661423).

213312311121 is a wasteful number, since it uses less digits than its factorization.

213312311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781363800.

The product of its digits is 216, while the sum is 21.

Adding to 213312311121 its reverse (121113213312), we get a palindrome (334425524433).

The spelling of 213312311121 in words is "two hundred thirteen billion, three hundred twelve million, three hundred eleven thousand, one hundred twenty-one".